Robot arm



FIG. 1 is a front, perspective view of a robot arm in accordance with anembodiment of the present design;

FIG. 2 is a front view of the robot arm of FIG. 1;

FIG. 3 is a rear view of the robot arm of FIG. 1;

FIG. 4 is a left side view of the robot arm of FIG. 1;

FIG. 5 is a right side view of the robot arm of FIG. 1;

FIG. 6 is a top view of the robot arm of FIG. 1; and,

FIG. 7 is a bottom view of the robot arm of FIG. 1.

CLAIM The ornamental design for a robot arm, as shown and described.